The former Celtic striker has been discussing the Scottish champions' back line.
Former Celtic striker Chris Sutton believes boss Ronny Deila 'clearly doesn't rate' Tyler Blackett, according to his regular column in the Daily Record.
And that has led him to question exactly who it was that signed the 21-year-old defender for Celtic, bringing him to Parkhead over the summer.
Indeed, the ex-striker highlighted Deila's inconsistency when selecting his back four during Thursday's 3-1 defeat against Molde in the Europa League, suggesting Blackett isn't trusted by the Norwegian.
Sutton told the Record: "Ronny clearly doesn’t rate Tyler Blackett. He picked Kieran Tierney to play at left-back ahead of him in the Fenerbahce match and then he opted for Efe Ambrose in Molde.
"So if he doesn’t fancy or rate Blackett, why did he sign him? That’s a mistake. And, if he didn’t sign him and someone else above him at the club did, then that is also a big worry.That needs [to be] clarified, for me.
"Whatever way it is, it’s not good and if Blackett can’t get into the team ahead of Ambrose, he must be awful."
Celtic's selections defensively have certainly proved an issue and the Bhoys will do well to settle on a consistent back four ahead of a crucial period.
Needless to say, the biggest miss in that back line is Virgil van Dijk, who left for Southampton over the summer.
Many questioned whether the 24-year-old could cope in the Premier League but, so far, he seems to be doing just fine while Celtic toil without him. The Bhoys have plenty of issues at full-back, meanwhile. Can the likes of Dedryck Boyata, Ambrose, Izaguirre or Blackett really be trusted for any big occasion?
Celtic host Dundee United at 3pm on Sunday afternoon, when supporters will be looking for a response - but it will be one that can't make up for Thursday night regardless.